Could you clarify what you mean by 'travel'? Like, you want to print out all the keys and their values? Or, do you want just 'Value 1', 'Value 2', 'Value 3'? In general, an easy way to display hash contents is to Data::Dumper. 
use Data::Dumper;

#define your hash here
%HOH = (
    Pegname1 => { section1 => { val1 => 'Value 1' },
              section2 => { val2 => 'Value 2' }
              section3 => { val3 => 'Value 3' }

    Pegname2 => { section1 => { val1 => 'Value 1' },
              section2 => { val2 => 'Value 2' }
              section3 => { val3 => 'Value 3' }
)

#print its contents
print Dumper(\%HOH);

[download]

For your second question, I'd suggest you look at Programming Perl, and check out the chapter on complex lists (i.e. arrays of arrays, hashes of hashes, hashes of arrays, etc.).

-- Burvil

In reply to Re: hash inside hash inside hash by bowei_99
in thread hash inside hash inside hash by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.